Preparation and use of xanthogen chloropropyl formate flotation reagents
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United States of America Patent
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Feb 2, 1982
Issued Date -
N/A
app pub date -
Apr 19, 1979
filing date -
Jan 26, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Flotation of copper sulfide ores in acid circuits has historically been promoted with ethyl xanthogen ethyl formate. Significantly improved results are achieved with the reaction product of ethyl or isopropyl zanthate with a chlorinated chloroformate. Sodium ethyl or isopropyl zanthate is prepared in an all-liquid system in the presence of excess alcohol. Chlorinated isopropyl chloroformate is prepared by reaction of phosgene and propylene epoxide in the presence of performed product as deluent and activated carbon as catalyst. The chloroformate and xanthate-alcohol mixture are reacted, and the alcohol may be recovered from the aqueous phase.
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